Pump



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CHRISTIAN S. KURTZ, OF EPI-IRATA, PENNSYLVANIA.

PUMP.

Specification of Letters Patent.

Patented June 13, 1922.

Application filed June 25, 1920. Serial No. 391,673.

To all whom it may concern:

Be it known that I, CHRISTIAN S. Kunrz, a citizen of the United States, residing at Ephrata, in the county of Lancaster and State of Pennsylvania, have invented a new and useful. Pump, of which the following is a specification.

This invention relates to pumps and more especially to a supplemental valve for use in connection therewith whereby the pump is kept primed and whereby sand is kept away from the flap or leather valves of the pump so that it cannot injure them, any sand entering the pump being free to gravitate therefrom before the supplemental valve constituting the present invention reaches its seat, thereby avoiding all possibility of sand or other foreign matter from contacting with the valve and injuring it, thereby insuring the priming of the pump at all times.

With the foregoing and other objects in view, which will appear as the description I proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings-- Figure 1 is a section through a portion of a pump embodying the present improvements.

Figure 2 is a section on line 2-2, Figure 1.

Referring to the figures by characters of reference 1 designates the pump cylinder connected at its upper end, as ordinarily, to a delivery pipe 2 and provided with a piston 8 adapted to be reciprocated by a rod 4 connected to it in any manner desired. This piston, as ordinarily, has an opening 5 adapted to be closed by a flap valve 6 during the upward movement of the piston.

The lower end of the cylinder is secured within the upper end portion of a casing 7 having an interior shoulder 8 supporting a disk 9 in which is formed an opening 10. This disk constitutes a valve seat and the valve, which has been indicated at 11, is clamped between this disk and the lower end of the cylinder 1, as shown.

The casing 7 has an intermediate reduced bore 12 the upper end of which is flared as shown at 13 while the lower end is tapered downwardly as at 14- to a restricted inlet passage 15. A suitable packing ring 16 is mounted on the reduced portion 1d and con stitutes a valve seat. This seat normally supports a tapered valve 17 the stem 18 of which extends into the passage 15 and has a reduced terminal. 19. Suitable packing ma terial 20 is arranged around the stem 18 of the valve and forms the wear surface of the head of the valve and is adapted normally to contact with the seat 16. Guide ribs 20 are formed on the wall of the casing 7 between the shoulder 8 and the flared portion 13, the inner edges of these ribs being flush and in alignment with the wall of the intermediate portion 12. The head of the valve 17 fits snugly within the portion 12 and is adapted to slide along the wall thereof and between the ribs 20.

It will be understood that during the upper stroke of the piston 3 the water thereabove will be lifted while an additional supply will be admitted to the lower portion of the cylinder 1 from the interior of the casing 7. The suction set up will be sufiicient not only to open the valve 11 but also to lift the valve 17 substantially to the position indicated by dotted lines in Figure 1. Thus water will be free topass around the valve and to the opening 10. Any sand that might be lifted with the water will not pass above the level of the valve 17 and, during the downstroke of the piston 3, when the valves are relieved of suction, the valve 17 will gravitate slowly between ribs 20 and within the portion 12 of the casing until it finally reaches its seat 16. As the sand below the valve is heavier than the water it will move downwardly faster than the valve 17 and when this valve reaches its seat all of the sand will have gravitated from the easing 7 so that, during the next stroke of the piston there will be no sand in the casing 7 to be drawn up into the pump cylinder.

Importance is attached to the fact that the valve 17 fits snugly in the ribs 20 and the reduced portion 12 because as the result of this arrangement the downward movement of the valve is retarded sufiiciently to allow sand to pass downwardly in advance of the valve. Thus a valve of this type is advantageous as compared with an ordinary flap valve which would slam shut immediately upon the beginning of the up stroke of the piston. Furthermore as the valve 17 acts slowly to close onto its seat, it eliminates the valve pounding or hammering which takes place where superposed flap valves are used and which result in quickly hardening the valves and rendering them useless.

What is claimed is:

1. The combination with a pump cylinder having a valve at its lower end and a lifting piston mounted for reciprocation in the cylinder, of a casing connected to the cylinder and below the valved end thereof, said casing having a reduced bore therein provided with a seat and a passage extending from the bore, and a valve normally resting on said seat and slidable upwardly within the bore during the suction of water through the casing and into the cylinder and having a snug fit with the walls of said bore whereby retarded closing movement is obtained to permit sand to pass downward in advance of the valve,

2. The combination with a pump cylinder and a lifting piston mounted for reciprocation therein, said cylinder having a check valve at its lower end, of a casing connected to and extending below the cylinder, said casing having a reduced bore and a passage opening into the bore, there being a seat at one end of the reduced bore, and a valve mounted for sliding movement in said reduced bore and normally bearing on the seat to close the passage, said valve fitting snugly within the bore and being liitable by suction out of the bore to admit liquid to the cylinder during the suction stroke of the piston.

3. A casing for connection to and below a pump cylinder, said casing having an intermediate reduced bore and an inlet passage opening into the lower end oi the here, an inclined valve seat at the lower end of the bore, guide ribs extending upwardly within the casing and flush with the wall of the bore, and avalve normally bearing upon the seat and having its head slidably mount ed within and closely hugging the wall of the bore, said valve being lift-able by suction to position its head between the ribs and allow the flow of liquid from'the bore and into the cylinder, said valve closingslowly after casing portion and being liftable by suction out of said portion into said chamber be tween said guides to adapt liquid to enter the cylinder, said valve having a slow closing movement incident to its snug engagement with the walls and guides.

5. The combination with a pump cylinder having a valve at its lower end and a lifting piston for reciprocation in the cylinder, of a casing connected to the cylinder below the valved end thereof, said ca sing having a valve seat therein and a slow closing valve resting on said seat when the pump is inoperative and slidable upwardly in said casing during the suction of water through the casing and into the cylinder.

6. An attachment for pumps comprising a casing having means for connection with a pump cylinder below the valved end there of, a valve seat in said casing, a poppet valve mounted in the casing, and means to insure the slow closing of said valve to permit the free passage in advance thereof, of sand and other foreign matter to prevent the contact of such matter with the valveand consequent injury thereto.

"7. An attachment for a pump comprising a casing having means at one end for c0nnection with the valved end of the pump cylinder, said casing having its lower portion reduced and provided with a valve seat at the bottom. of said reduced portion, a poppet valve mounted in said casing having a head snugly fitting the walls of the reduced portion of the casing to insure the slow closing of the valve.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

CHRISTIAN S. KURTZ.

' Witnesses:

JOHN W. GEHR, WALTER C. lVANNEn. 

